/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *      http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* eslint-disable import/prefer-default-export */
export const throttle = (fn, delay) => {
    let timer = null;
    return function (...args) {
        const context = this;
        clearTimeout(timer);
        timer = setTimeout(() => {
            fn.apply(context, args);
        }, delay);
    };
};

export const getScrollTop = () => {
    let scrollTop = 0;
    if (document.documentElement && document.documentElement.scrollTop) {
        ({scrollTop} = document.documentElement);
    } else if (document.body) {
        ({scrollTop} = document.body);
    }
    return scrollTop;
};

export const getLink = link => {
    if (`${link}`.length > 1 && /^\/[^/]/.test(`${link}`)) {
        return `${window.rootPath}${link}`;
    }
    return link;
};

export const getParameter = (search, name) => {
    const [, query = ''] = search.split('?');
    const [hit = ''] = query.split('&').filter(item => name === item.split('=')[0]);
    const [, value = ''] = hit.split('=');
    return value;
};
